Abstract
We discuss several problems of current interest concerning the electronic structure and Fermiology of complex materials where computational approaches have been very useful. Specifically, we consider the first-principles band theory predictions of spectral intensities for angle-resolved photoemission (ARPES) and positron annihilation angular correlation (2D-ACAR) spectra from YB a2 Cu 3 O 7 , and the effects of substitutions on the elctronic structures of simple cubic perovskites and the La214 high-T c compound.
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